[DRBD-user] drbd 35Tb disk with ext4

Vasiliy I Ozerov vozerov at 2reallife.com
Tue May 28 10:50:50 CEST 2013

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Good day! 

I have a little problem running drbd.

System: Debian Squeeze 6.0.6
Kernel: 2.6.32-5-amd64
DRBD: 8.3.13-2

Config for home resource:

resource home {
on backup {
device    /dev/drbd1;
disk      /dev/sda5;
meta-disk /dev/ram0[14];

on backup2 {
device    /dev/drbd1;
disk      /dev/sda4;
meta-disk internal;

ram0 - 2Gb Size

I make the following actions:

# drbdadm create-md home
# /etc/init.d/drbd start

Then I see the following:

root at backup2 /etc/drbd.d # cat /proc/drbd
version: 8.3.7 (api:88/proto:86-91)
srcversion: EE47D8BF18AC166BE219757

 1: cs:Connected ro:Secondary/Secondary ds:Inconsistent/Inconsistent B r----
    ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:4293787648

Then I started sync:

root at backup /etc/drbd.d # drbdadm -- --overwrite-data-of-peer primary home
root at backup /etc/drbd.d # cat /proc/drbd
version: 8.3.7 (api:88/proto:86-91)
srcversion: EE47D8BF18AC166BE219757

 1: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent B r----
    ns:11232 nr:0 dw:0 dr:11436 al:0 bm:0 lo:0 pe:21 ua:0 ap:0 ep:1 wo:b oos:4293777088
[>....................] sync'ed:  0.1% (4193140/4193152)M
finish: 110:26:11 speed: 10,560 (10,560) K/sec

It's ok. 

But when I try to mount /dev/drbd1 I see the following:

root at backup /etc/drbd.d # mount -t ext4 /dev/drbd1 /home/
mount: wrong fs type, bad option, bad superblock on /dev/drbd1,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

And in dmesh I saw, that drbd started to sync only 4Tb:

[37354503.285925] block drbd1: Forced to consider local data as UpToDate!
[37354503.285972] block drbd1: Creating new current UUID
[37354509.351392] block drbd1: drbd_sync_handshake:
[37354509.351424] block drbd1: self ACD94469A7E81D3F:0000000000000004:0000000000000000:0000000000000000 bits:1073446912 flags:0
[37354509.351478] block drbd1: peer 0000000000000004:0000000000000000:0000000000000000:0000000000000000 bits:1073446912 flags:0
[37354509.351531] block drbd1: uuid_compare()=2 by rule 30
[37354509.351557] block drbd1: Becoming sync source due to disk states.
[37354509.351585] block drbd1: Writing the whole bitmap, full sync required after drbd_sync_handshake.
[37354509.401466] block drbd1: meta data flush failed with status -5, disabling md-flushes
[37354509.401501] block drbd1: 4095 GB (1073446912 bits) marked out-of-sync by on disk bit-map.
[37354509.401540] block drbd1: conn( Connected -> WFBitMapS )
[37354511.724636] block drbd1: conn( WFBitMapS -> SyncSource )
[37354511.724676] block drbd1: Began resync as SyncSource (will sync 4293787648 KB [1073446912 bits set]).

I tried to use flexible-meta-disk, but with no luck.

Can you help me to solve this problem?

Thank you!
Vasiliy I Ozerov

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